Multi-time-scale D/A Hybrid Simulation for Power Distribution Networks
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Solution Overview
Problem
Current simulation systems for complex power distribution networks face challenges in achieving real-time, multi-time-scale simulations due to limitations in accuracy, cost, and complexity, particularly in modeling distributed power supplies and power electronic devices, leading to inadequate transient and steady-state simulations.
Innovation Solution
A multi-time-scale D/A hybrid simulation system is developed, integrating digital and analog simulations through a D/A hybrid interface and synchronization mechanism, using FPGA-based technology for real-time synchronization and parallel calculation, and physical simulation circuits to model complex power distribution networks, enabling accurate and efficient simulation of AC and DC grids with distributed power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical simulation is used for power distribution network, then simulation accuracy is improved, but simulation time increases and hardware cost increases
Solution Approach 1:
The simulation system is segmented into multiple time-scale modules: electromagnetic transient simulation for fast dynamics and steady-state simulation for slow dynamics. Each module operates independently at its appropriate time scale, allowing accurate transient simulation without requiring the entire system to run at the slowest time scale, thus reducing overall simulation time while maintaining accuracy.
Solution Approach 2:
An intermediary synchronization mechanism is introduced to coordinate between the electromagnetic transient simulation module and steady-state simulation module. This mediator manages data exchange and timing coordination between different simulation scales, enabling accurate multi-time-scale simulation without the time penalty of pure physical simulation.
2Measurement precision
If physical simulation is used for power distribution network, then simulation accuracy is improved, but hardware cost increases
Solution Approach 1:
The patent uses digital copies and mathematical models to represent physical power distribution network components. Instead of requiring physical hardware for every component, digital simulations with high-fidelity models are used, reducing hardware costs while maintaining simulation accuracy through sophisticated algorithms and computation.
3Productivity
If all-digital multi-time-scale simulation is used, then cost is reduced and calculation speed is improved, but simulation accuracy deteriorates
Solution Approach 1:
The simulation system dynamically adjusts the simulation method based on the time scale and system conditions. For fast electromagnetic transients, detailed electromagnetic models are used with small time steps. For slower steady-state variations, simplified models with larger time steps are employed. This dynamic adaptation maintains accuracy where needed while improving calculation speed where possible.
Solution Approach 2:
The patent changes simulation parameters such as time step size, model detail level, and numerical method based on the operating conditions and time scale. During transient events, smaller time steps and more detailed models are used. During steady-state operation, larger time steps and simplified models are applied, optimizing both accuracy and calculation speed.
4Measurement precision
If detailed modeling of distributed power supplies and power electronic devices is implemented, then simulation accuracy is improved, but device complexity increases
Solution Approach 1:
Different levels of modeling detail are applied locally to different components based on their importance and dynamics. Power electronic devices and distributed power supplies that significantly affect transient behavior are modeled with high detail. Other components are modeled with appropriate simplification. This localized quality approach maintains accuracy for critical components while reducing overall modeling complexity.
Data Source
AI summary
An embodiment provides a multi-time-scale Digital/Analog (D/A) hybrid simulation system and simulation method therefor for a complex power distribution network and a computer storage medium, and is intended to solve existing problems about multi-time-scale modeling and simulation of the complex power distribution network and simulation accuracy and efficiency of the complex power distribution network. The embodiment provides a multi-time-scale D/A hybrid simulation solution for the complex power distribution network, designs a D/A hybrid interface device and a coordination mechanism, and may effectively implement multi-time-scale real-time simulation of equipment (for example, power electronic equipment including a complex topological structure and a novel control strategy) of the complex power distribution network and multi-time-scale simulation analysis on grid connection/disconnection of a distributed power supply such as a wind-driven generator, a photovoltaic power generator and a gas turbine and an electric vehicle as well as interactive influence with the power distribution network.